"Elemiddle" schools serve the needs of young adolescents, aged 10 to 14, in any combination of grades 5 through 8, as part of an organizational structure that includes lower grades. Research has shown that middle schools with 6-8 grade spans and K-8 schools are most likely to implement child-centered programs, practices, and policies than schools with 7-9 or 7-12 grade spans. (MLH)